Blasting paper sheet



Patented Aug. 14, 1923.

UNITED STATES PATENT OFFICE.

'-' GEORGE-S. CLARK, OF BOWLINGGREEN, KENTUCKY, ASSIGNOR, BY MESNE .ASSIGNr-f MENTS, TO CLARK 'PATENT TU BING CORPORATION E WEST VIRGINIA.

CO., OF WHEELING, WEST VIRGINIA, A

BLASTING IACEEIIR SHEET.

To all whom t may conce/ra Be it known that I, GEORGE S. CLARK, a citizen -of the United States, residing at Bowling Green, in the county of Varren and State of Kentucky, have invented certain new and useful Improvements in Blasting .Paper Sheets; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the saine.

In mining operations and particularly in the coal industry it is a matter of common knowledge that no two seams of coal have the same structure, hence different sized cartridges are required to obtain the best results and prevent windy shots which are not very i effective in the accomplishment of work but which are destructive to props and brattices and tend to ignite coal dust and otherwise cause explosions.

The present invention provides a blasting sheet in the form of a strip of determinate length formed into a roll and gummed along one edge on one side and having longitudinal lines at different distances from the otheredge and an intermediate scale on the reverse side, the longitudinal lines determining the diameter and the intermediate scale the length of the shell.

Other objects and advantages will be apparent and suggest themselves as the nature of the invention is understood.

While the drawings illustrate an embodiment of the invention it is to be understood that in adapting the same to meet different conditions and requirements, various changes in the form, proportion and minor details of construction may be resorted to without departing from the nature of the invention. Referring to the accompanying drawings forming a part of the specification,

Figure l is a plan view 0f a portion of a blasting sheet embodying the invention,

Figure 2 is a reverse View of the sheet illustrated in Figure l, and

Figure 3 is a detail view showing the manner of forming the shell.

Corresponding and like parts are referred to in the following description and designated in the several views of the drawings by like reference characters.

The strip of paper l is gummed on one side along an edge thereof, as indicated at 2.

Application filed March 1, 1921, Serial No. 448,941. Renewed January 9, 1923.

Y The opposite or reverse side of the strip is ruled to provide a scale 3 and a plurality of longitudinal lines 4. The scale 3 may be graduated in any manner and is usually laid off in inches and fractional parts thereof after the manner of an ordinary carpenters ruler. The scale 3 is disposed intermediate the longitudinal edges of the strip 1 to be eXposed at all times and enable the required length of shell to be readily determined. The longitudinal lines 4 are disposed along the edge portion of the strip opposite that provided with the gum or adhesive 2. The lines 4 are in parallel relation with one another and with the edges of the strip and are located at different distances from the edge of the strip to enable the required diameter of shell to be readily ascertained. It is proposed to designate the lines 4 to enable the strip 1 to be folded to obtain a shell of required diameter. The strip of paper 1 may be of any construction according to the specific requirement so as to obtain the best results in practice.

It being required to construct a cartridge of a given length and diameter, the shell therefor is prepared by detaching a portion of the strip 1 of ample length and folding longitudinal edge portions thereof upon the intermediate portion. The edge portion of the strip provided with the longitudinal lines 4 is first folded upon the intermediate portion with the ruled lines 4 facing upwardly and the scale 3 facing downwardly. The edge portion of the strip lhaving the gum or adhesive 2 is next folded upon the edge portion provided with the longitudinal lines 4, the folding of the gummed edge portion depending upon the required diam-y eter of the shell. The gummed edge of the strip registers with the selected line 4 corresponding with the diameter of the shell to be formed. The strip thus folded is made secure by moistening the gummed edge 2 and pressing the same upon the edge portion of the strip provided with the ruled lines 4. This completes the shell, the length of which is determined by the scale 3 which, as stated. is exposed, thereby enabling the folded and gummed sheet forming the shell to be separated at the proper point.r whereby to obtain a shell of the required length according to the size of the cartridge required in the mining operation.

It should be stated that the tube may be provided in its completed form, as shown in Figure 3, with a scale graduation enabling the required length to be torn therefrom.

5 The tube in flattened form constitutes in effeet a hollow strip.

lVhatis claimed is A blasting sheet Consisting of a strip of paper gumined on one side along an edge 10 thereof and having the reverse side ruled to provide an intermediate scale, and a plurality of longitudinal lines at diierent dis# tanoes from the opposite edge of the strip, whereby to determinel al shell of required diameter and length.

In testimony whereof I ali-ix my signature in presence of two witnesses. Y Y l GEORGE S. CLARK. itnessesz WV. H. JONENS, PAUL VRIGHT. 

